CN114614409A - Polypropylene cable and conductor shielding layer repairing method and application thereof - Google Patents
Polypropylene cable and conductor shielding layer repairing method and application thereof Download PDFInfo
- Publication number
- CN114614409A CN114614409A CN202210283700.0A CN202210283700A CN114614409A CN 114614409 A CN114614409 A CN 114614409A CN 202210283700 A CN202210283700 A CN 202210283700A CN 114614409 A CN114614409 A CN 114614409A
- Authority
- CN
- China
- Prior art keywords
- polypropylene
- heating
- metal mold
- semi
- shielding layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/16—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for repairing insulation or armouring of cables
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/009—Cables with built-in connecting points or with predetermined areas for making deviations
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
Landscapes
- Processing Of Terminals (AREA)
Abstract
The application belongs to the technical field of polypropylene cables, and particularly relates to a polypropylene cable and a conductor shielding layer repairing method and application thereof. The application provides a polypropylene cable and a conductor shielding layer repairing method and application thereof, wherein the repairing method comprises the following steps: wrapping a semi-conductive nylon cloth tape with a pencil point slope insulating layer, wrapping a polypropylene semi-conductive shielding tape with the semi-conductive nylon cloth tape, and heating the polypropylene semi-conductive shielding tape through a metal mold to melt the polypropylene semi-conductive shielding tape; wherein, earlier the pencil stub slope shielding layer of peeling off for smooth transition can make shielding layer and conductor laminating effectual after the melting is restoreed, has prevented that the quality hidden danger from appearing in the cable around package semi-conductive nylon strap, directly heats through self-heating metal mold after wrapping polypropylene semi-conductive shielding strap at last, has realized the restoration to polypropylene semi-conductive shielding layer, has solved the technical problem who lacks polypropylene semi-conductive shielding layer repair technology among the prior art.
Description
Technical Field
The application belongs to the technical field of polypropylene cables, and particularly relates to a polypropylene cable and a conductor shielding layer repairing method and application thereof.
Background
The excellent electrical properties of crosslinked polyethylene (XLPE) make crosslinked polyethylene insulation materials widely used as insulation layers for long-distance transmission overhead lines and urban underground cables.
However, the crosslinked polyethylene is a thermosetting material, cannot be degraded by itself, only incineration and crushing landfill modes can be adopted during recovery, harmful crosslinking byproducts can be generated in the crosslinking reaction process, the environmental protection pressure is high, and the requirement of a green power grid is not met. Different from crosslinked polyethylene, the production flow of polypropylene is simple and convenient, crosslinking and degassing processes are not needed, the energy consumption is low, the occupied area of a factory building is small, the polypropylene can be recycled after the service life is reached, and the polypropylene has excellent electrical performance, high melting temperature, good high temperature resistance and good water resistance, so that the polypropylene insulating material is already applied as a power cable insulating layer, such as a 10kv polypropylene cable which is currently produced and applied; different from crosslinked polyethylene, polypropylene is a thermoplastic material, if a flexible film is used for heating and molding a polypropylene conductor shielding layer, the semiconductive shielding layer and the insulating layer of an original cable can be melted and softened after being heated, so that the semiconductive shielding layer and the insulating layer are easily caused to bulge and deform, the shielding layer and the insulating layer are easily mixed and melted together when the cable is serious, an electric field can be distorted in the operation process of the cable, and hidden dangers are caused to the normal operation of the cable.
Disclosure of Invention
In view of this, the application provides a polypropylene cable and conductor shielding layer repair method and application thereof, with the semi-conductive nylon strap around the pencil stub slope insulating layer earlier after, with the semi-conductive nylon strap of polypropylene package, heat the melting of polypropylene semi-conductive shielding strap messenger polypropylene semi-conductive shielding strap through metal mold heating at last, thereby realized the restoration to the polypropylene semi-conductive shielding layer, and avoided the soft mould to bulge easily when the polypropylene semi-conductive shielding layer carries out the heating mould and warp, the technical problem who lacks polypropylene semi-conductive shielding layer repair process among the prior art has been solved.
The first aspect of the application provides a method for repairing a polypropylene cable conductor shielding layer, which comprises the following steps:
step 1, respectively peeling the left end and the right end of a position to be repaired of a polypropylene cable semi-conductive shielding layer into pencil-point slope shielding layers in smooth transition with a polypropylene cable conductor;
step 2, wrapping a semiconductive nylon cloth tape on the surface of the pencil point slope shielding layer to form a polypropylene cable wrapping the semiconductive nylon cloth tape;
the heating temperature is 170-190 ℃, and the heating time is 25-35 min.
Preferably, the metal mold includes: the resistance wire heating pipe heats the metal die, the electromagnetic heating metal die or the die temperature machine heats the metal die.
Preferably, the heating pipe heating metal mold includes: inserting a resistance wire heating pipe into a heating pipe hole of a metal mold, and introducing current to heat the metal mold;
preferably, the resistance wire heating pipe is inserted into a heating pipe hole of the metal mold, and the metal mold is heated by introducing current, and the metal mold comprises:
and (3) inserting the resistance wire heating pipes into the heating pipe holes of the metal mold in parallel at equal intervals, and introducing current to heat the metal mold.
It should be noted that the resistance wire heating pipes are inserted into the heating pipe holes of the metal mold in parallel at equal intervals, so that the uniformity of the resistance wire heating pipes for heating the metal mold can be improved, the uniformity of the heated polypropylene semiconductive shielding belt is improved, and the molding defects such as bulging deformation of the polypropylene semiconductive shielding layer and the like are avoided.
Preferably, the temperature is raised to 170-190 ℃ by taking 30 ℃ as a step, and then the mixture is heated for 25-35 min.
It should be noted that the step heating can reduce the energy consumption compared with the conventional heating method.
Preferably, the electromagnetic heating metal mold includes: and spirally winding a metal induction coil on the surface of the metal mold, and controlling the induction coil to electromagnetically heat the metal mold by adopting high-frequency induction heating equipment.
It should be noted that, compared with the resistance wire heating pipes which are easy to damage and different heating temperatures caused by the difference of the powers of the resistance wire heating pipes, the high-frequency induction heating equipment is adopted to control the induction coil to heat the metal mold, and the electromagnetic induction heating is utilized, so that the uniformity of the heating temperature can be improved, and the molding defects such as bulging deformation of the polypropylene semi-conductive shielding layer and the like are avoided.
Preferably, the mold temperature machine heating metal mold includes: and (3) flowing the heat conduction oil of the mold temperature controller into the spiral oil duct of the metal mold, and heating the metal mold by the mold temperature controller.
It should be noted that, compared with the resistance wire heating pipes which are easy to damage and the heating temperature is not well controlled due to the difference of the powers of the resistance wire heating pipes, the control precision of the heating temperature can be improved by using the uniform heat conduction effect of the liquid heat conduction oil, and the molding defects such as bulging deformation of the polypropylene semi-conductive shielding layer and the like are avoided.
Preferably, before pencil stub slope shielding layer surface is around wrapping semiconduction nylon strap, still include: and the roughness of the pencil stub slope shielding layer is not lower than Ra1.6 by grinding and polishing.
It should be noted that, the pencil stub slope shielding layer is polished until the roughness is greater than ra1.6, which is beneficial to improving the winding effect of the polypropylene shielding tape, so that the polypropylene shielding tape is compact and smooth, gaps and air gaps are reduced, micro bubbles generated in the melting process are avoided, and the electrical performance of the polypropylene cable is reduced.
Preferably, the metal mold is an aluminum alloy metal mold.
In a second aspect, the present application provides a polypropylene cable repaired by the above repair method.
It should be noted that, when the polypropylene cable shielding layer is damaged by various accidents, the repairing method provided by the application can be used for repairing, and the repaired insulating layer can meet the requirements of the electrical performance of the interface.
In a third aspect of the present application, there is provided the use of the above-described repair method for connecting polypropylene cables.
Because of the limitation of production, transportation and laying conditions, no matter the crosslinked polyethylene cable or the polypropylene cable can not produce infinite length, therefore, a plurality of cables need to be connected by using a middle joint of the cable, but the crosslinked polyethylene cable is connected by using a cold-shrinkage rubber type cable joint at present, the connection principle is that the electric performance of the interface between the cable and the joint is ensured by using the holding power of the material, the conventional pressure resistance and partial discharge tests can be carried out, however, the polypropylene is a thermoplastic material unlike the crosslinked polyethylene which is a thermosetting material, the polypropylene cable is easy to be compressed and deformed by the cold-shrinkage rubber piece, the electric field polarization hidden danger exists at the interface between the cable and the joint, the electric performance of the interface can not be ensured, after the cable cores are connected by adopting the existing technologies such as heat release welding and the like, the shielding layer is repaired by adopting the repairing method provided by the application, and the connection of the plurality of polypropylene cables can be realized, the defects that the potential electric field polarization hazard exists and the electrical performance of the interface cannot be ensured due to the use of a cold-contraction rubber type cable joint are avoided.
In summary, the present application provides a polypropylene cable and a method for repairing a conductor shielding layer thereof and an application thereof, wherein the method for repairing the conductor shielding layer comprises: wrapping a semi-conductive nylon cloth tape with a pencil point slope insulating layer, wrapping a polypropylene semi-conductive shielding tape with the semi-conductive nylon cloth tape, and heating the polypropylene semi-conductive shielding tape through a metal mold to melt the polypropylene semi-conductive shielding tape; wherein, the pencil-head slope shielding layer which is firstly stripped to be in smooth transition can ensure that the bonding effect of the shielding layer and the conductor is good after the completion of the fusion repair, the semiconductive nylon cloth belt and the polypropylene semiconductive shielding belt which are used as semiconductive materials can shield interference current, and the semiconductive nylon cloth belt is wrapped, the performance of higher fusion temperature of the semiconductive nylon cloth belt is utilized to prevent the polypropylene semiconductive shielding belt from permeating into a polypropylene cable conductor in the fusion repair process and prevent the polypropylene cable conductor from protruding to the semiconductive shielding layer and an insulating layer to cause quality hidden danger or direct breakdown by utilizing the performance of higher toughness, wear resistance and tensile resistance of the nylon after the completion of the fusion repair, and finally the self-heating metal mold is directly used for heating after the wrapping of the polypropylene semiconductive shielding belt, on the one hand, compared with a soft film, the heat-conducting performance of the metal is excellent, thereby improving the uniformity of the heating of the polypropylene semiconductive shielding belt, on the other hand compares with the mantle, and metal mold is heated and is not warp to can directly mould polypropylene semi-conductive shielding area, thereby realized the restoration to polypropylene semi-conductive shielding layer, and avoided the mantle to warp easily when the soft mould carries out the heating moulding to polypropylene semi-conductive shielding layer, solved and lacked the technical problem of polypropylene semi-conductive shielding layer repair technology among the prior art.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a schematic structural view of a polypropylene cable provided in examples 1-4 of the present application before repair;
fig. 2 is a schematic structural diagram of a polypropylene cable pencil-point slope provided in examples 1 to 4 of the present application;
fig. 3 is a schematic structural diagram of the whole polypropylene cable provided in embodiments 1 to 4 of the present application after wrapping a polypropylene shielding layer;
FIG. 4 is a schematic view of a metal mold structure provided in example 1 of the present application;
wherein, 1-polypropylene cable shielding layer to-be-repaired position left side cable, 2-polypropylene cable shielding layer to-be-repaired position right side cable, 3-polypropylene cable shielding layer to-be-repaired position, 4-polypropylene cable conductor, 5-resistance wire heating tube heating metal mold, 11-polypropylene cable shielding layer to-be-repaired position left side insulation shielding layer, 12-polypropylene cable shielding layer to-be-repaired position left side conductor insulation layer, 13-polypropylene cable shielding layer to-be-repaired position left side shielding layer, 14-polypropylene cable shielding layer to-be-repaired position left side conductor, 21-polypropylene cable shielding layer to-be-repaired position right side insulation shielding layer, 22-polypropylene cable shielding layer to-be-repaired position right side insulation layer, 23-polypropylene cable shielding layer to-be-repaired position right side shielding layer, 24-polypropylene cable conductor at the right side of the position to be repaired of the polypropylene cable shielding layer, 41-polypropylene semi-conductive shielding belt, 51-forming hole, 52-heating tube hole and 53-bolt hole.
The specific implementation mode is as follows:
the application provides a polypropylene cable and a conductor shielding layer repairing method and application thereof, firstly, a semiconductive nylon cloth tape is wound on a pencil-head slope insulating layer, then, the semiconductive nylon cloth tape is wound on the semiconductive nylon cloth tape, and finally, the semiconductive nylon cloth tape is heated through a metal mold to melt the semiconductive polypropylene shielding tape, so that the polypropylene shielding layer is repaired, the problem that the polypropylene shielding layer is easy to bulge and deform when the soft mold is used for heating and molding the semiconductive polypropylene shielding layer is solved, and the technical problem that the polypropylene shielding layer repairing process is lacked in the prior art is solved.
The technical solutions in the embodiments of the present application will be described clearly and completely below, and it should be understood that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The reagents or raw materials used in the following examples are commercially available or self-made.
Example 1
Referring to the structures shown in fig. 1-4 of the specification, this embodiment 1 provides a first method for repairing a conductor shield of a polypropylene cable, comprising the following steps:
step 1, processing a polypropylene cable insulating layer, stripping the left end and the right end of a position to be repaired of a polypropylene cable shielding layer, and stripping by adopting a special cable stripping knife to form an insulating pencil stub slope and a cable inner conductor smooth transition;
step 2, wrapping an insulating pencil stub slope, semi-lapping a semi-conductive nylon cloth belt at a position to be repaired of a polypropylene cable shielding layer, gradually lapping the semi-conductive nylon cloth belt with the insulating pencil stub slope, and covering the semi-conductive nylon cloth belt to be 20-30 mm above the insulating pencil stub slope;
and 5, inserting the resistance wire heating pipes into heating pipe holes of a metal mold in parallel at equal intervals, introducing current to heat the metal mold to enable the polypropylene shielding belt to realize self-melting, melting and connecting the polypropylene shielding belt with the position to be repaired of the original polypropylene cable insulating layer, and performing prefabrication and forming, wherein the heating temperature of the resistance wire heating pipes is 170-190 ℃, and the heating time is 25-35 min.
It should be noted that the resistance wire heating pipes are inserted into the heating pipe holes of the metal mold in parallel at equal intervals, so that the uniformity of the metal mold heated by the resistance wire heating pipes can be improved, the uniformity of the heated polypropylene semiconductive shielding tape is improved, and the molding defects such as bulging deformation of the polypropylene semiconductive shielding layer are avoided.
Example 2
This example 2 provides a second method for repairing a polypropylene cable conductor shielding layer, which is different from the method in example 1 in that step 5, a metal induction coil is spirally wound on the surface of the metal mold, and a high-frequency induction heating device is used to control the induction coil to heat the metal mold.
Compared with the resistance wire heating pipes which are easy to damage and different heating temperatures caused by the difference of the powers of the resistance wire heating pipes, the high-frequency induction heating equipment is adopted to control the induction coil to heat the metal mold, the uniformity of the heating temperature can be improved by utilizing electromagnetic induction heating, and the molding defects of bulging deformation and the like of the polypropylene semi-conductive shielding layer are avoided, wherein the electromagnetic induction heating temperature of the high-frequency induction heating equipment is 170-190 ℃, and the heating time is 25-35 min.
Example 3
The third method for repairing the shielding layer of the polypropylene cable conductor is provided in this embodiment 3, and the difference between the repairing method and embodiment 1 is that step 5, heat conducting oil of a mold temperature controller flows into a spiral oil duct of the metal mold, and the mold temperature controller heats the metal mold.
Compared with the resistance wire heating pipes which are easy to damage and poor in control of heating temperature caused by the difference of the powers of the resistance wire heating pipes, the control precision of the heating temperature can be improved by utilizing the uniform heat conduction effect of the liquid heat conduction oil, and the molding defects such as bulging deformation of the polypropylene semi-conductive shielding layer and the like are avoided, wherein the temperature of the heat conduction oil is 170-190 ℃, and the heating time is 25-35 min.
Example 4
This embodiment 4 provides a fourth method for repairing a polypropylene cable conductor shielding layer, where the method for repairing a polypropylene cable conductor shielding layer is different from that in embodiment 1, before the surface of the pencil stub slope shielding layer is wrapped with a semi-conductive nylon woven tape, the method further includes: and the roughness of the pencil stub slope shielding layer is not lower than Ra1.6 by grinding and polishing.
It should be noted that, the pencil point slope shielding layer is polished to a roughness greater than ra1.6, which is beneficial to improving the winding effect of the polypropylene shielding tape, so that the polypropylene shielding tape is compact and smooth, gaps and air gaps are reduced, micro bubbles generated in the melting process are avoided, and the electrical performance of the polypropylene cable is reduced.
It should be noted that the preparation method of the polypropylene semiconductive shielding tape used in examples 1 to 4 of the present application includes: plasticizing the polypropylene semi-conductive particles by a small-sized extruder to extrude strips, and then pressing the strips into strips by a strip prefabricating and forming press. The thickness of the semi-finished polypropylene semi-conductive shield after being manufactured is controlled to be 0.2-0.3 mm, and the width of the semi-finished polypropylene semi-conductive shield is controlled to be 15-20 mm.
And after the heated mold is naturally cooled, the shielding layer is subjected to shape modification, grinding and polishing until the roughness of the abrasive belt is 600# or more, the surface of the abrasive belt is in smooth transition, and no burrs exist. After the shielding layer is shaped, ground and polished, the thickness of the shielding layer is more than 50% of the original cable conductor shielding layer.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A method for repairing a polypropylene cable conductor shielding layer is characterized by comprising the following steps:
step 1, respectively peeling the left end and the right end of a position to be repaired of a polypropylene cable semi-conductive shielding layer into pencil-point slope shielding layers in smooth transition with a polypropylene cable conductor;
step 2, wrapping a semiconductive nylon cloth tape on the surface of the pencil point slope shielding layer to form a polypropylene cable wrapping the semiconductive nylon cloth tape;
step 3, wrapping a polypropylene semi-conductive shielding tape on the surface of the semi-conductive nylon cloth tape to form a polypropylene cable wrapping the polypropylene semi-conductive shielding tape;
step 4, placing the polypropylene cable wrapped with the polypropylene semiconductive shielding tape in a metal mold for heating;
the heating temperature is 170-190 ℃, and the heating time is 25-35 min.
2. The repair method according to claim 1, wherein the metal mold comprises: the resistance wire heating pipe heats the metal die, the electromagnetic heating metal die or the die temperature machine heats the metal die.
3. The repair method of claim 2, wherein the resistance wire heating tube heating the metal mold comprises: and inserting the resistance wire heating pipe into a heating pipe hole of the metal mold, and introducing current to heat the metal mold.
4. The repair method of claim 3, wherein the inserting of the resistance wire heating tube into the heating tube hole of the metal mold, the heating of the metal mold by applying the electric current comprises: and (3) inserting the resistance wire heating pipes into the heating pipe holes of the metal mold in parallel at equal intervals, and introducing current to heat the metal mold.
5. The repair method according to claim 1, wherein the heating is performed in a manner of heating to 170 ℃ to 190 ℃ in steps of 30 ℃ for 25min to 35 min.
6. The repair method according to claim 2, wherein the electromagnetic heating metal mold comprises: and spirally winding a metal induction coil on the surface of the metal mold, and controlling the induction coil to electromagnetically heat the metal mold by adopting high-frequency induction heating equipment.
7. The repair method according to claim 2, wherein the mold temperature machine heating metal mold comprises: and (3) flowing the heat conduction oil of the mold temperature controller into the spiral oil duct of the metal mold, and heating the metal mold by the mold temperature controller.
8. The repair method of claim 1, wherein the metal mold is an aluminum alloy metal mold.
9. A polypropylene cable repaired by the repair method of any one of claims 1-8.
10. Use of the repair method according to any one of claims 1 to 8 for connecting polypropylene cables.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210283700.0A CN114614409A (en) | 2022-03-22 | 2022-03-22 | Polypropylene cable and conductor shielding layer repairing method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210283700.0A CN114614409A (en) | 2022-03-22 | 2022-03-22 | Polypropylene cable and conductor shielding layer repairing method and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114614409A true CN114614409A (en) | 2022-06-10 |
Family
ID=81865683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210283700.0A Pending CN114614409A (en) | 2022-03-22 | 2022-03-22 | Polypropylene cable and conductor shielding layer repairing method and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114614409A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115224639A (en) * | 2022-07-29 | 2022-10-21 | 上海蓝昊电气江苏有限公司 | Self-heating rubber jacketed flexible cable repairing mold and repairing process |
-
2022
- 2022-03-22 CN CN202210283700.0A patent/CN114614409A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115224639A (en) * | 2022-07-29 | 2022-10-21 | 上海蓝昊电气江苏有限公司 | Self-heating rubber jacketed flexible cable repairing mold and repairing process |
| CN115224639B (en) * | 2022-07-29 | 2023-11-03 | 上海蓝昊电气江苏有限公司 | Self-heating rubber jacketed flexible cable repair die and repair process |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1929224B (en) | Switching method and mould for crosslinked polyethylene insulated power cable | |
| CN111834958B (en) | Single-core cross-linked power cable insulating joint of 500kV and below and manufacturing process | |
| CN106451313A (en) | Direct-current ultrahigh-voltage cross-linked cable soft connector and manufacturing process | |
| CN206272207U (en) | A kind of DC ultra-high-voltage crosslinked cable connecting hose | |
| CN107465154B (en) | Insulation shielding isolation joint of crosslinked polyethylene cable and injection molding manufacturing process thereof | |
| JPS5948499B2 (en) | Manufacturing method of laminate sheath | |
| CN110993154A (en) | Ultrahigh-pressure submarine cable soft joint and manufacturing method thereof | |
| CN110350376B (en) | Cross-linked polyethylene power cable intermediate connection joint and manufacturing method thereof | |
| CN114614409A (en) | Polypropylene cable and conductor shielding layer repairing method and application thereof | |
| CN115133467A (en) | Manufacturing process of extra-high voltage direct current 800kV cable wrapping fusion type soft joint | |
| CN112271657A (en) | Polypropylene 10kV molded cable connector and manufacturing method thereof | |
| AU616402B2 (en) | Method of joining articles | |
| CN115065025A (en) | High-voltage cable flexible joint repair interface reinforcing method and device based on liquid phase impregnation | |
| CN113937589A (en) | Cable connection construction process | |
| CN102354589A (en) | Patch for rapidly repairing damages of external insulating layers of thermal shrinkage wires and cables | |
| CA1138167A (en) | Method and apparatus for splicing hose | |
| CN201336535Y (en) | Pressing sheet for repairing cable insulation jacket | |
| CN114360764A (en) | Manufacturing method of high-pressure submarine cable factory joint | |
| CN113725804B (en) | Cable, cable flexible joint, insulation recovery method, mold and detection method thereof | |
| CN114566312A (en) | Polypropylene cable and insulating layer repairing method and application thereof | |
| CN115065009A (en) | Medium-high voltage crosslinked polyethylene insulation fault repair power cable and repair method | |
| CN110513568B (en) | Heat preservation structure for pipeline joint | |
| CN112234532A (en) | Polypropylene 220kV molded cable connector and manufacturing method thereof | |
| CN114825195B (en) | Crosslinked polyethylene insulated cable connection method | |
| US20220415541A1 (en) | Heating Assembly and Method for Insulation System Restoration of a Power Cable |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |